Elevator safety device.



v G. N'ISSENSON;

. ELEVATOR SAFETY DEVICE. APPLICATION FILED ocr. 8. m5.

Patented Ap 16, 1918.

2 SHEETS-SHEET l- 5 nuewfoz G. NISSENSON.

ELEVATOR SA'FETY DEVICE.

APPLICATION FILED OCT-8.1935.

Patented Apr. 16(1918.

2 SHEETS-SHEET 2.

GEORGE 'ivrssnivson, or -1vnw YORK, n. Y.

- ELEVATOR SAFETY DEVICE.

- Application filed October 8, 1915.

To all whom it may concern.

Be it known that I, Gnonen' NIssENSoN, a citizen of the United States,and a resident of the city of New York, borough of lVIanhattan, in thecounty and State of New York, have invented a new and Improved ElevatorSafety Device, of which the following is a specification.

My invention relates to safety devices for elevators, lifts andsimilarly operating apparatus, and to means of controlling and startinga water, steam or otherwise operated elevator machine, which control isdependent upon and correlated to the position of the elevator car,platform andthe like, and of the door or doors of the elevator shaft,the object of the present invention being to provide an automaticdevice, whereby, when a door of the elevator-shaft is opened to permitaccess to or egress from an elevator car, )latform or the like, theoperating sheave or part of the elevator will vbe clutched or locked,and will remain .so clutched or locked duringthe entire time that thedoor so remains open and will prevent the starting of said elevator car,platform or the like, until the said door is 7 closed and locked.

The invention consistsof novel parts,and combinations of the same, ashereinafter more fully described, and as pointed out in the claims.

A practicalembodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in. all theviews.

Figure 1 is a front view of the device, as arranged for attachment inthe operation of a hydraulic elevator, showing the toothed plate engagedwith the toothed rack, attached to the rim of an operating sheave,commonly in use to control the admission and release of water pressureto and from the cylinder of an elevator machine.

Fig. 2 is a similar View showing the toothed or grooved plate,disengaged from the toothed or grooved rack of the rim of such anoperating sheave. I

Fig. 3 represents the door switch: attached to the door frame of anelevator-shaft door, with the electric contact shown to be separatedupon the door being'closed.

Fig. 4 represents the door switch, at-' Specification of Letters Patent.

Patented Apr. 16,1918.

Serial No. 54,768.

tached to the door frame of an elevator shaft door,-showing door partlyopen and switch contacts engaged.

The device consists of a standard electric lifting solenoid 1, mountedand made fast to an iron frame 2, by bolts 2 and 2 The solenoid 1 isconnected by means of acornplete wire circuit with a door switch 40.lVithin the core of the solenoid l is a movable member 3, which has aslight inward movement as soon as an electric circuit is establishedthrough the said complete wire circuit. The solenoid 1, its movablemember 3, and the frame 2, which form a power unit, are joined to andmade permanent with the member of an iron bracket 4, by means of bolt 5,and bracket 23. The frame is strengthened by a brace 6, fastenedtogether with the bolts 6 and 6. Within this frame 4, 4 and 6 is mountedthe mechanical movement of the device, which consists of a movable rod7, one end of which extends through'frame member 4 and isprovided with ascrew thread 11 to receive the movable member 3, the latter having inits center acorresponding threaded aperture to allow the threaded end 11of the rod 7 to be introduced or withdrawn so as to'permit of itsadjustment to the required length, after which adjustment it is lockedwith the lock nut 12. The other end of said movable rod 7 extendsthrough a bracket Sto receive a spiral spring 9 and nut 10 toretain thespring. A collar '20, fitted on rod 7 and set screw 21 are also providedfor adjustment of the distance of travel of movable member 3 and rod 7,a shifting of the stop c0llar'20 toward the bracket 8, shorteningthe"distance' of travel of rod 7 and member 3. An aperture 22 isprovided in movable rod 7 to engage one end of a lever 24, pivoted atits median distance on the bracket 23. The other end of lever 24 isconnected with lever 29 by means of a link 25, pivoted at 26 and 26*.Link 25 is introduced into and moves freely within a slotted aperture34, "provided inthe brace 6 offrame'4," 4, the said free movement of thelink 25 within said slotted aperture being produced whenever 25 and oflever 29 by introducing the pivot 2o into one o1 the apertures 30. @neend of the lever 29 is pivoted upon brace 6 at 27, and the opposite endis free. The lever 29' has a radial movement upon its fixed or pivotedend 2?, which movement is actuated .set to engage a correspondingtoothed or grooved rack 32, which is attached to an operating sheave 33or the like, by bolts 35 or other suitable means. The electric solenoidl, and its movable member 3, are operated and controlled by means of aswitch 40, which comprises outer frame or casing 48 and a push rod 41,partly protruding through an aperture in one side of sald frame orcasing 48 and moving in and through said aperture. Push rod 41 has atits inner end an insulating plate 42, the ends of which are carried andmove upon two stationary guide rods 49, 49, through an aperture at eachend of plate 42, provided for that purpose, said rods 49, 49 being fixedto opposite sides. attached to and carried by push rod 41 and msulatingplate 42 is a knife blade 43. The push rod 41 1s normally held inforward position by means of springs 44, carried on the guide rods 49,49, and hearing at one end agamstmsula g plate 42. The second andstationary insulating plate is fixed within the frame or casing 48 uponthe side through which push rod 41 protrudes and is provided with anaperture in line with that on the same side 01": the frame or casing-48, so as to permit push rod 41 to move in line through plate 45 and theside of frame 48-. The insulating plate 45 carries electric con.-nections 46, 4?; which are arranged for engagement by knife blade 43.Knife blade 43 engages the electric connections 46, 46 when push rod 41and plate 42 are in for ward position, thereby completing the electriccircuit to the solenoid, and only becoming disengaged and breaking saidcircuit when push rod 41 and plate 42 are depressed by pressure againstthe outer end of 'pushrod 41. By 4'? is represented conventionally adoor of an elevator shaft, whichin Fig. 4 is shown open and without itspressure exerted upon push rod 41, which through the action of thesprings 44., 44 bearing upon plate 42 is in its forward. position whenthe knife blade 43 is in contact with the electric connections 46, 46;and in Fig. 3 is shown closed, with its pressure exerted upon push rod41, which,'with plate 42 and knife blade 43, are thereby depressed, theknife blade 43 being then out of contact with the electric connections46, 46..- Although the form of switch described is preferred for use inconnection with the neease device, it may be replaced by any other "formof switch or other contact making and breaking means.

From the above description it will be evi lent tiat as soon as acomplete circuit is movement bringing the position of the link 25directly in line with. the position of lever 24 at 26. The movement oflever 29 will cause the toothed or grooved block 28 to entire toothedorgrooved rack 32, attached to the operating sheeve 33, and there bywill prevent the rack and the operating sheave from turning and willkeep it in a stationary position. ddZhGll block 28 and rack are thusengaged, lever 24 and link 25 being placed in a straight line withreference to each other and rigid, will prevent the pressure of theoperating sheave 33 on block 28 from breaking the line of rigidity oflever 24 and link 25.

will remain thus engaged or clutched until the electric circuit isbroken by the door switch contacts being separated when the door isclosed (as in Fig. 3), when the action of the spring 9 will pull themovable rod 7 back to its former position, and the motion being impartedto lever 24 and link 25 will bring them back to their respective formerpositions, and the lever 29 connected with them will consequentlydisengage the toothed or grooved block 28 from the toothed or groovedrack 32, which is attached to the rim of the operating sheave 33 or thelike, thereby permitting the free movement of the latter in anydirection and placing the elevator machine again in motion.

When the elevator has been stopped at a given floor, it will beunderstood that some part of the toothed rack 32 stands opposite to somepart of the toothed bar 28. As is well known, there is considerableleeway in finding the neutral position of the operating sheave. Thepresent device is so constructed that, no matter how slightly thetoothed rack of lever 24 will be imparted. 'to lever 29 by means of thelink 25, the said Lever 29 and rack 9 and bar may overlap, an efi'ectivelocking action will be secured when the door is opened, holding thecontroller in neutral position, thus operating the electrical connections from the door switch or detector 40, wiich thrusts the toothedbar' toward the controlling sheave. The toggle 24, 25 not only thruststhe toothed bar toward the sheave, but when the teeth are engaged itlooks them positively against an accidental displacement. This effectivelocking is obtained no matter at what part of its neutral position thesheave may stand, so long as one or more teeth of the bar overlap one ormore teeth of the rack. In consequence of this no longitudinaladjustment of the bar or rack is needed, since they will operate means,and although this device is shown to be operated by electric poweracting through the door switch upon the lifting solenoid of the device,this power may be substituted or replaced by air, oil or water pressure,in which case the solenoid is to be substituted or replaced by acylinder and piston, or other similar equivalent mechanical means.

I claim as my invention:

1. An elevator safety device, including in combination, a rotatablecontroller for controlling the power apparatus, a detector operated bythe closed or unclosed condition of an elevator door, a peripherallyoperating locking means adapted to positively engage and lock thecontroller in any position Within the range of its neutral movement, andconnections from said detector for operating said locking means when thedoor is not properly closed, said locking means comprising a pair oftoothed racks, one on the controller periphery, and said connectionscomprising a toggle for forcing the other rack into engagement with thefirst.

2. An elevator safetydeviee, including in combination, a rotatablecontroller for controlling the power apparatus, a detector operated bythe closed or unclosed condition of an elevator door, a peripherallyoperating locking means adapted to positivelyengage and lock thecontroller in any position within the range of its neutral movement, andconnections from said detector for operating said locking means when thedoor is not properly closed, said locking means comprising a pair oftoothed racks, one on the controller periphery, and said connectionscomprising a device for forcing the other rack into engagement with thefirst.

GEORGE NISSENSON. Witnesses:

DOROTHY G. SAMUELS, JOSEPH F. CATEE.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents,

Washington, D. G. s

